During terminal stance and pre-swing, the GRF is directed which way?

During terminal stance and pre-swing, the GRF is directed which way?

• A. An anteriorly
• B. Posteriorly
• C. Medially only
• D. Laterally only

Answer: (A)

During terminal stance and pre-swing the body is pushing off the forefoot to propel forward, so the ground reaction force has a forward (anterior) component. The center of pressure moves toward the toes, and the resulting GRF vector points ahead of the foot, driving forward progression. This anterior direction contrasts with early stance, where the GRF often has a backward (posterior) component to resist forward motion, and with medial or lateral components which are not the dominant direction in these phases.

During terminal stance and pre-swing the body is pushing off the forefoot to propel forward, so the ground reaction force has a forward (anterior) component. The center of pressure moves toward the toes, and the resulting GRF vector points ahead of the foot, driving forward progression. This anterior direction contrasts with early stance, where the GRF often has a backward (posterior) component to resist forward motion, and with medial or lateral components which are not the dominant direction in these phases.